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Light Dependent Reactions  Cyclic Photophosphorylation—Electron transfer with PS I  Electrons from PSI go through an ETS and create ATP--electrons then goes back to PSI  Electrons are cycling!  Not enough energy for most plants

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Light Dependent Reactions  Non-cyclic Photophosphorylation—Electron transfer with PS I & PS II  PS II gathers light energy which raises electron to ETS—ATP is made by chemiosmosis  Electron goes to PS I and then is raised to a 2 nd ETS—NADP is reduced to NADPH  Electrons in PS II are replaced by photolysis of H 2 O

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 CAM Plants—crassulacean acid metabolism  Plants open stomata at night & close during the day—helps conserve water  CO 2 enters stomata at night & is incorporated into organic acids stored in central vacuoles  CO 2 is released from acids in the morning to enter Calvin Cycle